Square Lake (Square Lake Park)
Minnesota · 1.5–20.7 m
A spring-fed 200-acre lake in Washington County near Stillwater with some of the clearest water in the Twin Cities metro (typically 10-25 ft visibility), making it the metro area's most popular dive site. The county park beach area has underwater training platforms plus sunken boats, canoes and the tail section of a Cessna airplane; maximum depth is about 68 ft. It hosts regular shop-led fun dives, including dusk dives.